coverage andto the millions of americans who have attempted to use healthcare.gov to shop and enroll in healthcare coverage, i want to apologize to you that the website has not worked as well as it should." >> reporter:at times the witness was almost window dressing. peppered with questions about when she'll have enrollment numbers for obamacare, marilyn tavenner stuck to a script >>"we'll have those numbers in mid-november." "mid-november." "mid-november." "mid-november." >> reporter:and with that the political headknocking began -- in the hearing room where open warfare over health care has been waged for decades. a democratic congressman leaped out of his chair claiming his party worked years ago to try to improve the republican prescription drug plan-- but when it came to obamacare, the g-o-p didnt exactly return the favor. >>"the massachusetts experience was very slow initially; and it started to ramp up over time. we expect the same type of projections." >> reporter: >>how many of you stood up to do that.none no one >>"it's a false choice to say it's obamacare or nothing >>"are you serious t